Like another poster, it depends. It is like Pepsi vs Coke or ATI vs Nvidia. One is always better and the another will catch up. I personally use both and I like VMware more. I manage 400 server VMs and 1,200 VM Workstations at work and it is a no brainer to stick with the same product.
Can you comment on why you like VMWare more? I have been a longtime Fusion user, but with the 2012 MBP, I'm having some USB issues which are not there in Parallels or Bootcamp (a dongle for connecting to my car no longer works, which is one of my main reasons for running Windows at all). I've taken it up with Fusion support, but their product definitely took a hit in my book.